Leyline Centrifuge

{5}, {t}: Add five mana in any combination of
colors.
Activated abilities of lands cost an additional
"Tap an untapped land you control" to activate
unless they're mana abilities.
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The Mage Towers were built at the coalescence of the
leylines, intending to focus their power on a singular
purpose — to the detriment of all others.
Artwork source:
https://www.artstation.com/artwork/B1bRRk